Samsung CKF5607L Service Manual page 28

7 Troubleshooting
7-2 Horizontal Line on CRT (Root Cause : Vertical Deflection Parts Fail)
Does output pulse of 50Vp-p
appear at Pin 5 of IC301?
Yes
Does rectangular signal output
18
at Pin 5 of IC300?
Yes
Does DC 13 V appear at Pin 2
of IC300?
Yes
Does DC -12 V appear at Pin 4 of
IC300?
Yes
Check swap IC300.
7-3 Vertical Line on CRT (Root Cause : Horizontal Deflection Parts Fail)
Does PWM output signal appear
6
at Pin 26 (H-out) of IC401?
Yes
Does 12Vp-p signal appear at
Emitters of Q403 and Q404?
Yes
Does 120Vp-p signal appear at
11
Pin 1 of T401?
Yes
Check CN401, CN402, D409
and Q410
7-2
No
Check connector CN300 and CN301.
No
Check CN300 and CN301.
No
Check DC 13 V Line.
No
Check DC –12 V Line.
No
Does DC 5 V appear at Pin 32
of IC401?
Yes
No
Check Q403 and Q404.
No
Check Q405.
WAVEFORMS
18
CH1 P-P = 43.0 V
Check IC401.
6 9.24 V (IC401, #26) 11
CH1 P-P = 9.24 V CH1 RMS = 6.048 V
WAVEFORMS
43.0 V (IC300 #5)
CH1 RMS = 5.34 V
No
Check 5V,
12V Line.
93.6 V (T401, #1)
CH1 P-P = 93.6 V CH1 RMS = 55.2 V
CKF5607L